在Debian安装多个版本PHP
apt -y install apt-transport-https lsb-release ca-certificates curl
wget -O /etc/apt/trusted.gpg.d/php.gpg https://packages.sury.org/php/apt.gpg
sh -c 'echo "deb https://packages.sury.org/php/ $(lsb_release -sc) main" > /etc/apt/sources.list.d/php.list'
apt update
apt install php5.6 [PHP 5.6]
apt install php7.0 [PHP 7.0]
apt install php7.1 [PHP 7.1]
apt install php7.2 [PHP 7.2]
apt install php7.3 [PHP 7.3]
apt install php7.4 [PHP 8.0]
apt install php8.1 [PHP 8.1]
指定默认版本
update-alternatives --set php /usr/bin/php5.6